Answer:
=x2+7x−8
Step-by-step explanation:
x2+8x−x−8
=x2+8x+−x+−8
Combine Like Terms:
=x2+8x+−x+−8
=(x2)+(8x+−x)+(−8)
=x2+7x+−8
Use the quadratic formula to find the solutions.<span><span><span>−b±<span>√<span><span>b2</span>−4<span>(ac)</span></span></span></span><span>2a</span></span><span><span>-b±<span><span>b2</span>-4<span>(ac)</span></span></span><span>2a</span></span></span>Substitute the values <span><span>a=−1</span><span>a=-1</span></span>, <span><span>b=0</span><span>b=0</span></span>, and <span><span>c=40</span><span>c=40</span></span> into the quadratic formula and solve for <span>xx</span>.<span><span><span>0±<span>√<span><span>02</span>−4⋅<span>(−1⋅40)</span></span></span></span><span>2⋅−1</span></span><span><span>0±<span><span>02</span>-4⋅<span>(-1⋅40)</span></span></span><span>2⋅-1</span></span></span>Simplify.Tap for fewer steps...Simplify the numerator.Tap for more steps...<span><span>x=<span><span>0±4<span>√10</span></span><span>2⋅−1</span></span></span><span>x=<span><span>0±410</span><span>2⋅-1</span></span></span></span>Simplify the denominator.Tap for more steps...<span><span>x=<span><span>0±4<span>√10</span></span><span>−2</span></span></span><span>x=<span><span>0±410</span><span>-2</span></span></span></span>Simplify <span><span><span>0±4<span>√10</span></span><span>−2</span></span><span><span>0±410</span><span>-2</span></span></span>.<span><span>x=±2<span>√10</span></span><span>x=±210</span></span>The result can be shown in both exact and approximate form.<span><span>x=±2<span>√10</span></span><span>x=±210</span></span><span>x≈6.324555,−<span>6.324555</span></span>
Answer:
d)c=4.20h
Step-by-step explanation:
the rate is 16.80 /4
4.20 per hour
earn = hours * rate
c = 4.20*h
It had to Option D you are very welcome
Answer:
3x - 6.
Step-by-step explanation:
Three times x , then subtract 6:
That would be 3x - 6.